Multichannel Room Impulse Response Generation With Coherence Control

A method is proposed by which an arbitrary number of room impulse responses (RIRs) is generated from one input RIR. The method works by convolving the input RIR with a multitude of filters, one for each desired output RIR. The filters are designed in such a way that the coherence between all possible pairs of output RIRs feature assignable frequency-dependent values. An application example is given where the values for the coherence are given by the diffuse field coherence functions for the microphones in a five-element microphone array. The limitations in terms of achieving the desired coherence values exactly and avoiding spectral coloration are also discussed. The proposed method is most suitable for the part of the RIR that does not contain strong discrete reflections.